>1j21B (B:) observed residues (from ATOM records)
mkivlaysggldtsiilkwlketyraeviaftadigqgeeveearekalrtgaskaiald
lkeefvrdfvfpmmragavyegyyllgtsiarpliakhlvriaeeegaeaiahgatgkgn
dqvrfeltayalkpdikviapwrewsfqgrkemiayaeahgipvppysmdanllhisyeg
gvledpwaeppkgmfrmtqdpeeapdapeyveveffegdpvavngerlspaallqrlnei
ggrhgvgrvdivenrfvgmksrgvyetpggtilyharravesltldrevlhqrdmlspky
aelvyygfwyaperealqayfdhvarsvtgvarlklykgnvyvvgrkapkslyrgydqkd
aegfikiqalrlrvralver